/* Asks user to guess a hidden number */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_NUMBER 100
/* external variable */
int secret_number;
/* prototypes */
void initialize_number_generator(void);
void choose_new_secret_number(void);
void read_guesses(void);
int main(void)
{
    char command;
    printf("Guess the secret number between 1 and %d.\n", MAX_NUMBER);
    initialize_number_generator();
    do {
        choose_new_secret_number();
        printf("A new number han been chosen.\n");
        read_guesses();
        printf("Play again? (Y/N) ");
        scanf(" %c", &command);
        printf("\n");
    } while (command == 'y' || command == 'Y');
    return 0;
}
/**********************************************************
 * initialize_number_generator: Initializes the random    *
 * number generator using                                 *
 * the time of day.                                       *
 **********************************************************/
void initialize_number_generator(void) {
    srand((unsigned) time(NULL));
}
/**********************************************************
 * choose_new_secret_number: Randomly selects a number    *
 * between 1 and MAX_NUMBER and                           *
 * stores it in secret_number.                            *
 **********************************************************/
void choose_new_secret_number(void) {
    secret_number = rand() % MAX_NUMBER + 1;
}
/**********************************************************
 * read_guesses: Repeatedly reads user guesses and tells  *
 * the user whether each guess is too low,                *
 * too high, or correct. When the guess is                *
 * correct, prints the total number of                    *
 * guesses and retures.                                   *
 **********************************************************/
void read_guesses(void) {
    int guess, num_guesses = 0;
    for (;;) {
        num_guesses++;
        printf("Enter guess: ");
        scanf("%d", &guess);
        if (guess == secret_number) {
            printf("You won in %d guesses!\n\n", num_guesses);
            return;
        } else if (guess < secret_number)
            printf("Too low; try again.\n");
        else
            printf("Too high; try again.\n");
    }
}